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Specifically the number of engines simultaneously ignited. So not summing up over different stages. I am interested in the max for both number of engines and number of combustion chambers.

What I have found so far:

  • Soyuz: 20 chambers (+12 vernier chambers) / 5 engines
  • Energia: 20 chambers / 8 engines
  • Falcon 9: 9 chambers / 9 engines

Disqualified rockets:

  • N1: 30 chambers / 30 engines / No successful launches
  • This: 44 engines / Sounding rocket; majority of engines were part of scientific payload; this is an upper bound though

Will the Falcon Heavy have more chambers / engines then any successful rocket to date? Does any other successful rocket have 9 or more engines? or has SpaceX already claimed that record?

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    $\begingroup$ Is this question, an answer, in the question itself? space.stackexchange.com/questions/10361/… $\endgroup$
    – geoffc
    Commented Nov 29, 2017 at 17:55
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    $\begingroup$ Soyuz has 4 chambers per set of turbo pumps for fuel and oxidizer. 5 engines instead of 4. $\endgroup$
    – Uwe
    Commented Nov 29, 2017 at 17:56
  • $\begingroup$ @geoffc I saw that question, but it only lists those as examples, not record holders. $\endgroup$
    – Lex
    Commented Nov 29, 2017 at 18:27
  • $\begingroup$ @RussellBorogove I hadn't seen that question. It discounts strap on boosters, but the answers seem to give sufficient coverage that if I had seen it, I probably wouldn't have asked my question. $\endgroup$
    – Lex
    Commented Nov 29, 2017 at 18:30
  • $\begingroup$ The number of vernier chambers of Soyuz is 12, not 8. 4 at the core stage and 2 for each of 4 boosters. $\endgroup$
    – Uwe
    Commented Nov 29, 2017 at 18:41

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